A Sub-GHz Low-Power Receiver Employing Resistive-Feedback-Tuned LNA With 2.1-dB NF and 106-dB Gain Tuning Range

Abstract

This letter presents a configurable sub-GHz low-power receiver achieving a low noise figure (NF) and a large gain tuning range. An inverter-based low-noise amplifier (LNA) with a resistive-feedback-tuning technique is realized to achieve low power and optimize NF while tuning the gain level. Implemented in 130-nm CMOS technology, this receiver occupies an active area of 2.3 mm2. It achieves a low power of 3.63 mW over a large gain tuning range of 106 dB in 6 dB steps. It also achieves a low NF of 2.1 dB and an image rejection ratio (IRR) of over 37.1 dB.